This machine is similar to the famous "Laughing Sal" that jiggled and laughed at so many of our now defunct amusement parks.  Jolly Jack came as either an English Sailor or the rarer English "Bobby". After dropping a penny in the slot, a cam would lower a tone arm on to a 78 RPM record with a laugh track recorded on it, while Jack had a laughing fit (the speaker hidden in the door behind a metal plate). Four other cams were responsible for making Jack rock back and forth , and side to side, which also made his eyes roll around in his head.